<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
                <span
                    v-if="item.redirect === 'noRedirect' || index == levelList.length - 1"
                    class="no-redirect"
                >{{ item.meta.title }}</span
                >
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script setup>
import { compile } from 'path-to-regexp'
import { reactive, ref, watch } from 'vue'
import { useRoute, useRouter } from 'vue-router'

const levelList = ref(null)
const router = useRouter()
const route = useRoute()

const getBreadcrumb = () => {
    let matched = route.matched.filter((item) => item.meta && item.meta.title)

    const first = matched[0]
    if (first.path !== '/') {
        matched = [{ path: '/home', meta: { title: '首页' } }].concat(matched)
    }

    levelList.value = matched.filter(
        (item) => item.meta && item.meta.title && item.meta.breadcrumb !== false
    )
}

const pathCompile = (path) => {
    const toPath = compile(path)
    return toPath(route.params)
}

const handleLink = (item) => {
    const { redirect, path } = item
    if (redirect) {
        router.push(redirect)
        return
    }
    router.push(pathCompile(path))
}

getBreadcrumb()
watch(route, getBreadcrumb)

</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
